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Evaluation of Optical Instruments for Real-Time Continuous Monitoring of Smoke Particulates
The two FRM instruments compared extremely well. Figure 11 shows that the FRM samplers located beside each other during the 2000 laboratory tests had a slope of 0.99 and an R² value of 0.97 over a range of PM2.5 mass concentrations of 40 to 215 µg/m³. Results of the collocation studies of the Fire Sciences Laboratory's gravimetric sampler to the FRM during the 1998 and 2000 laboratory tests indicate that the Fire Sciences Laboratory's sampler measured about 10-percent lower than the FRM. Statistical results show a slope of 0.90 with an R² value of 0.93 (figure 12). Based on this comparison, all Fire Sciences Laboratory sampler results used in the real-time continuous comparison were corrected by 1.11 (1/0.90) to equalize their results with the FRM.
Figure 11—Comparison of the two BGI Federal Reference Method
gravimetric samplers used in the 2000 laboratory tests.
Figure 12—Regression results of the collected Federal Reference
Method and the Fire Sciences Laboratory gravimetric instrument
from the 1998 and 2000 laboratory tests.
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